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Library of Congress Subject Areas (16339)
- A General Works (67)
  - AC Collections. Series. Collected works (19)
  - AI Indexes (General) (24)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (21)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (28)
  - B Philosophy (General) (4)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (5)
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- E History America (1)
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- G Geography. Anthropology. Recreation (42)
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- H Social Sciences (5613)
  - H Social Sciences (General) (1201)
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  - HD Industries. Land use. Labor (752)
    - HD1401 Agriculture-Economic aspects (101)
    - HD28 Management. Industrial Management (263)
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- J Political Science (788)
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- L Education (804)
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- M Music and Books on Music (12)
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- N Fine Arts (807)
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    - N400-3990 Art museums, galleries, etc. (13)
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- P Language and Literature (430)
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    - P87 Communication. Mass Media (332)
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- Q Science (1285)
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  - QC Physics (29)
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- R Medicine (20)
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- S Agriculture (1355)
  - S Agriculture (General) (1156)
    - S590-599.9 Soils. Soil science (155)
    - S631-667 Fertilizers and Improvement of the soil (133)
  - SB Plant culture (237)
    - SB599-990.5 Pests and Diseases (56)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (120)
  - SD Forestry (25)
  - SF Animal culture (21)
  - SH Aquaculture. Fisheries. Angling (24)
  - SK Hunting sports (1)
- T Technology (5133)
  - T Technology (General) (1672)
    - T55.4-60.8 Industrial engineering. Management engineering (414)
    - T201 Patents. Trademarks (6)
    - T385 Computer Graphics (86)
    - T58.6-58.62 Management Information Systems (487)
  - TA Engineering (General). Civil engineering (General) (558)
  - TC Hydraulic engineering. Ocean engineering (9)
  - TD Environmental technology. Sanitary engineering (890)
  - TE Highway engineering. Roads and pavements (34)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (2)
  - TH Building construction (66)
  - TJ Mechanical engineering and machinery (49)
  - TK Electrical engineering. Electronics Nuclear engineering (103)
    - TK5105 Computer Network (43)
    - TK5105.882 Internet (37)
    - TK5105.888 World Wild Web (43)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1798)
    - TP155 Chemical engineering (1356)
    - TP368 Food processing and manufacture (308)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (9)
  - TS Manufactures (236)
    - TS 155-194 Production Management, Operations Management (170)
    - TS 180-TS180.8 Material Handling (9)
  - TT Handicrafts Arts and crafts (9)
  - TX Home economics (16)
- U Military Science (8)
  - U Military Science (General) (8)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (52)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (29)
  - Z719 Libraries (General) (9)
  - ZA Information resources (17)
    - ZA4050 Electronic information resources (6)
    - ZA4450 Databases (9)